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Some of our creatures announce themselves to a landscape, (I'm thinking about Curlews (obvs), with their beautiful, liquid spring call). Or Red Grouse, lifting from the heather in a burst of wing and indignation. Then there's Lapwings, tumbling over our damp fields like scraps of weather.
But what about Adders? They're quiet, cryptic - and easily missed. A flicker of pattern in the grass. A coil of life absorbing warmth on a bank. A species that has lived with us for centuries, but remains half-mythic in the public imagination: feared more often than understood, glimpsed more often than known.
In Nidderdale, however, these elusive snakes are beginning to tell a much bigger story.
A landmark DNA study has found that adder populations in Nidderdale are among the most genetically healthy and well-connected of those analysed in England - findings that suggest the area might be a nationally important stronghold for the species.
Commissioned by Natural England, with a full report due to be published later this year, the study used whole genome sequencing to examine adders across four contrasting English landscapes: Nidderdale, the North Pennines National Landscape, Norfolk and Suffolk.
And the results are striking. In Nidderdale’s upland moorland, adders appear to form large, freely mixing populations across broad areas of continuous habitat. In simpler terms: snakes are moving, breeding and remaining genetically connected across the landscape.
Elsewhere, particularly in more fragmented lowland landscapes in Norfolk and Suffolk, the picture is more troubling. There, adder populations on separate fragments of habitat showed significantly reduced genetic diversity and higher levels of inbreeding. For a species already in decline across Britain, that distinction is not only academic - but existential.
The Adder, Vipera berus, is the UK’s only native venomous snake. It's also legally protected under the Wildlife and Countryside Act 1981. Yet protection on paper doesn't guarantee survival on the ground. Across the country, adder populations have declined for decades, with research suggesting that many smaller and isolated populations could be at risk of local extinction in the coming years.
The reasons are familiar to anyone who follows the story of British nature: habitat loss, fragmentation, disturbance, changing land use, and the severing of once-connected places into smaller, lonelier ecological islands.
What this new research adds is a deeper biological warning. When populations become cut off from one another, they don't simply become smaller. They can become less resilient. Inbreeding can reduce their ability to withstand disease, environmental stress and change. A population might look healthy to the eye - a number of snakes still present in a particular place - while its genetic future is already narrowing.
That's why the Nidderdale findings are so important.
Here, the landscape itself appears to be doing some of the work conservationists dream of. The openness of upland moorland, the continuity of habitat, the relative absence of hard ecological barriers across broad areas: all of it seems to be helping adders remain connected.
But we can't be complacent: The study also found that even within Nidderdale, genetic connectivity can't be taken for granted. In one part of the landscape, a distinct adder population cut off from larger areas of habitat by barriers such as a road, improved pasture or conifer forest showed signs of reduced genetic diversity - despite appearing healthy in terms of the number of individual snakes present.
It's a quiet but important lesson. Even in a place as apparently wild and open as Nidderdale, modest barriers can begin to fragment wildlife populations over relatively short timescales.
For Kelly Harmar, biodiversity project officer for Nidderdale National Landscape, the research offers both reassurance and responsibility. “I’m fascinated by the new insights provided by the research,” she says. “The work has helped us better understand our landscape and we hope to use the research to help soften and remove barriers to species movement in Nidderdale.”
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Kelly's phrase - soften and remove barriers - is central to the future of conservation in places like this.
Because nature recovery isn't only about protecting individual sites, however precious they are. It's about connection. Corridors. Edges. Margins. The places between places. It's about whether a species can move through a landscape, adapt within it, and remain part of its living fabric.
And for our adders, that connectivity might just be the difference between survival and decline.
The study forms part of Natural England’s Species Recovery Programme and was conducted by Dr Axel Barlow and Professor Wolfgang Wüster at Bangor University and Dr Simon Maddock at Newcastle University. Natural England’s project lead is Dr William Askew, Senior Specialist in Genetic Technologies.
“We are hopeful that this collaborative project demonstrates the power of landscape-scale whole genome analyses, in identifying regions of stability and concern for the UK’s threatened species, such as Adder,” says Askew.
“This work forms a foundation that we will build on, covering further regions. Those already analysed such as Nidderdale now have a baseline with which future monitoring can be referenced against.”
It's a baseline that could prove crucial. Traditional wildlife surveys can tell us where a species is found and, to some extent, how many individuals are present. But whole genome sequencing reads an organism’s complete genetic code. It can reveal signs of isolation and inbreeding that would be invisible from a visual survey alone.
In Nidderdale, the science now confirms something deeply hopeful: that the landscape remains, in important ways, joined up.
This won't surprise those who know the area intimately. Nidderdale National Landscape has monitored adders for a number of years through its Adder Watch programme, which enourages residents and visitors to submit sightings and help build a clearer picture of where adders are present and how populations are faring.
The new research is taking that local knowledge into a national conservation context. It's indicating that Nidderdale isn't only home to adders. It might just be one of the places where the future of the species is still being held together.
That brings a particular kind of responsibility. Adders are often described as indicators of a healthy upland environment. Their presence, or absence, reflects the condition of the broader habitats on which they depend: moorland, rough grassland, woodland edge, heath, sunny banks and quiet places where disturbance is low and prey can be found.
So if we care for adders, then, we're doing much more than caring for adders.
We're caring for habitat mosaics, for invertebrates, for small mammals, for birds, for the structure and texture of a landscape. It's to understand that wildness doesn't only live in spectacular views, but in the small, warm, hidden places where a snake can bask unseen.
It's also to resist the old habit of treating certain species as problems because they unsettle us.
The adder’s venomous status has long made it a creature of anxiety. Yet encounters are rare, and the species is generally shy, avoiding people where it can. The greater threat is overwhelmingly in the opposite direction: from human disturbance, habitat pressure, persecution and fragmentation.
Nidderdale National Landscape is clear that precise survey locations won't be published for welfare and site security reasons. The public isn't encouraged to actively seek out adders or disturb them. Sightings can be reported through the Adder Watch programme, but the aim is careful monitoring, not wildlife tourism. we have to celebrate this species without its undue exposure. It has to be valued without being pursued.
There's something that fills MagNorth with pride about this story emerging from Nidderdale. This isn't a tale of spectacular reintroduction or sudden ecological drama. It's about a native species that has endured, largely unnoticed, in a landscape that still offers it room to move.
And in an age when so much of Britain’s nature story is told in losses, absences and warnings, it doesn't get much more important than this.
The lesson from Nidderdale isn't that everything is fine. The evidence of reduced genetic diversity in isolated pockets shows just how quickly barriers can begin to matter. Roads, improved pasture and conifer blocks may seem ordinary enough in a working landscape, but to a small, ground-dwelling reptile, they can become walls.
Still, the broader finding has to be hopeful. Nidderdale’s adders aren't just surviving. In genetic terms, many appear to be connected, diverse and resilient. And we have to focus on that.
Because the future of nature recovery in the North is going to depend on places like this: landscapes where people, science, farming, water companies, landowners, volunteers and conservation bodies work across boundaries rather than within them.
It's absolutely going to depend on the willingness to see the moor, the field edge, the woodland, the roadside verge and the quiet bank not as separate pieces, but as part of one living system.
The adders of Nidderdale may be elusive. Most of us will never see one. But thanks to this research, they have become messengers.
They tell us that connection matters. That hidden life can be healthier than we realised. That a landscape’s value isn't always visible at first glance. And that, sometimes, the most hopeful signs of nature recovery aren't written in headlines, but in DNA.
Adder sightings in Nidderdale can be reported through Nidderdale National Landscape’s Adder Watch programme.
For animal welfare and site security reasons, precise adder survey locations are not published, and people are not encouraged to actively seek out or disturb adders.
Header image: An Adder. (Will Askew)
